“Little Gem” Lung Tester and Developer

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A late 19th century American precursor to the modern day peak flow meter and spirometer. Blowing through this antique spirometry device spins the blades causing the disk to rotate behind a fixed pointer.

The resulting crude assessment of lung function depends on both peak flow and lung capacity. See “Measured Breath” and a picture of this instrument from the Smithsonian Institution. Quackery was never far behind, and it was also considered of benefit to “any lady who desires to symmetrically enlarge her bust”.

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